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Bad luck with SU, stack exchange users can be a tough crowd. I don't think you'll find such listings made public for a number of reasons - such as not wanting to make it easy for people to get to the sites and not giving the malicious types an easy time of finding out what has been discovered. Depending on your use case, checking URLs with a tool like Alex suggested is your best bet.
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John CAug 7 '12 at 0:24

Strictly speaking your question doesn't really belong here since it doesn't directly relate to using a web application. That said, it isn't a good fit for SU or probably even Webmasters SE. Perhaps if you gave more of why you are looking. Badmouthing SU probably doesn't help either since many people here also contribute there.
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John CAug 7 '12 at 2:20

Yea, many people just really go overboard with the "content curation"
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Calvin FroedgeAug 7 '12 at 4:33

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The reason that the Stack Exchange network of sites are so useful is because we ruthlessly get rid of things that are off-topic. "Broken Windows" theory and all that. But now these comments have completely diverged from their purpose, which is to help improve the content of a post.
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Al E.Aug 7 '12 at 12:32

Try the StopBadware Clearinghouse. That's probably where Google and Firefox are getting their information. There's not a list of the sites (at present there's nearly a million URLs in their database) but you can search for specific site URLs.